Method loadBooks

js/ReadingSystem.js:91–104

* 从 data.json 加载所有可用的课本数据 * @returns {Promise } 课本数据列表

()

   * @returns {Promise<Array>} 课本数据列表
   */
  async loadBooks() {
    if (this.state.books.length) return this.state.books;

    try {
      const response = await fetch('data.json');
      const data = await response.json();
      this.state.books = Array.isArray(data.books) ? data.books : [];
      return this.state.books;
    } catch (error) {
      console.error(this.config.ERROR_MESSAGES.LOAD_BOOKS, error);
      this.state.books = [];
      return [];
    }
  }

  /**
   * 根据 key 查找课本